Question: "What is {etymology} of {Riemann sum}, which has {studied at} is {Humboldt University of Berlin} ?"
Paraphrase: What is the thing of Vedanta, that has Universal Decimal Classification as 233?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q1156903 wdt:P138 ?answer . ?answer wdt:P69 wd:Q152087}
Answer: Bernhard Riemann